It requires no great share of ingenuity to accomplish this object, as an examination of modern fire-arms will fully testify; many pocket pistols that are manufactured at the present period, being at least as thin as those described by the noble author.
No. LXXXI.
A comb-conveyance carrying of letters without suspicion, the head being opened with a needle screw, drawing a spring towards one; the comb being made but after an usual form, carried in one's pocket.
NOTE.
A pocket comb and portable spoon, as described in this and the following article, with double sides to conceal any letter, paper, &c. are too simple to need a particular description.
No. LXXXII.
A knife, spoon, or fork, in an usual portable case, may have the like conveyances in their handles.
No. LXXXIII.
A rasping-mill for hartshorn, whereby a child may do the work of half-a-dozen men, commonly taken up with that work.